Mica 40Ar-39Ar isotopic chronology of Bizigou and Nanhegou copper deposit in Zhongtiao Mountain region, Shanxi Province, and its constraint on metallogenic tectonic setting
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摘要:
篦子沟、南河沟铜矿床位于华北克拉通中部造山带南缘，是山西中条山地区胡篦型铜矿的典型代表，因严格受地层控制，呈层状、似层状产出，也被认为是沉积岩型层状铜矿床。这些矿床的成矿年龄仍未被精确测定，成矿时代长期存在争议。在矿床学研究的基础上，对篦子沟、南河沟铜矿内与矿化有关的蚀变黑云母开展了高精度的40Ar-39Ar测年。获得篦子沟铜矿床黑云母40Ar-39Ar坪年龄为1825 ± 13 Ma(MSWD=8.86)，对应的等时线年龄为1820 ± 13Ma(MSWD=5.67)，反等时线年龄为1820 ± 13 Ma(MSWD=5.63)；南河沟黑云母40Ar-39Ar坪年龄为1861 ± 14 Ma(MSWD=8.17)，对应的等时线年龄为1864 ± 16 Ma(MSWD=8.31)，反等时线年龄为1865 ± 16 Ma(MSWD =8.47)。2个矿床的成矿年龄在误差范围内一致，表明胡篦型铜矿热液期矿化年龄限定在1850 Ma左右。此年龄与中部造山带约1.85 Ga峰期变质和退变质作用时间一致，综合已有研究成果推测，该期成矿事件与碰撞造山事件耦合。区域上，在侵入中条群的基性岩内发育含矿石英脉，对脉内与硫化物伴生的白云母进行40Ar-39Ar定年，获得其坪年龄1851 ± 13 Ma(MSWD=7.47)，对应的等时线年龄为1844 ± 19 Ma(MSWD=7.30)，反等时线年龄为1844 ± 19 Ma(MSWD=7.28)，说明基性岩内的含矿石英脉与矿区内的热液期矿化为同一地质事件的产物，印证了碰撞造山过程中产生的变质流体广泛作用于区域各地质体，且影响范围广泛。
Abstract:The Bizigou and Nanhegou copper deposits are located in the southern margin of the Trans-North China Orogen of the North China Craton.They are typical of the Hubi type copper deposits in the Zhongtiao Mountain area of Shanxi Province.Because they are controlled by strata and like stratified, they are also considered as the sediment-hosted stratiform copper deposits.However, the mineralization age of these deposits has not been determined and remain controversial.In this paper, high-precision 40Ar-39Ar dating of mica in Bizigou and Nanhegou copper deposits was carried out.The plateau age of Bizigou copper deposit sample was 1825 ± 13 Ma(MSWD=8.86), and the corresponding isochron age was 1820 ± 13 Ma(MSWD=5.67), inverse isochron age of 1820 ± 13 Ma(MSWD =5.63).The samples from Nanhegou copper deposit obtained plateau age of 1861 ± 14 Ma(MSWD=8.17), the corresponding isochron age is 1864 ± 16 Ma(MSWD=8.31), and the inverse isochron age is 1865 ± 16 Ma(MSWD= 8.47).The mineralization ages of the two deposits are consistent within the error range, indicating that the hydrothermal mineralization time of the Hubi type copper deposit is limited to ca.1850 Ma.This age is consistent with the peak metamorphism and retrometamorphism of ca.1.85 Ga in the Trans-North China Orogen.After that, it was found ore bearing quartz veins were developed in the mafic rocks of Zhongtiao Group.40Ar-39Ar dating of muscovite associated with sulfide in veins obtained the plateau age of 1851 ± 13 Ma(MSWD= 7.47), the corresponding isochron ages of 1844 ± 19 Ma(MSWD= 7.30)and inverse isochron ages of 1844 ± 19 Ma(MSWD= 7.28), indicating that the mineralization is the product of the same geological event as the hydrothermal mineralization in the mining area.It is proved that metamorphic hydrothermal fluid widely acted on geological bodies throughout the region during the collision orogeny.
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表 1 篦子沟铜矿黑云母40Ar/39Ar阶段升温测年数据
Table 1. 40Ar/39Ar stepwise heating analytical data for biotite from the Bizigou copper deposit
T/℃ 36Ar[fA] 37Ar[fA] 38Ar[fA] 39Ar[fA] 40Ar[fA] 40(r)/39(k) 40Ar(r)/% 39Ar(k)/% 年龄/Ma 2σ 800 176.69583 0.000000 36.50807 30.6123 67116.21 486.81277 22.20 1.91 1832 52 840 92.04321 0.000000 19.80003 38.4186 46725.32 508.25295 41.79 2.40 1882 30 880 50.57066 0.000000 20.61411 172.1045 102693.61 509.85963 85.45 10.74 1885.5 7.8 980 21.44286 66.750257 16.91062 205.6011 112053.42 514.33801 94.35 12.82 1895.7 9.8 1020 19.67498 0.000000 15.17454 178.7073 95857.73 503.85685 93.93 11.15 1871.6 6.2 1090 57.88834 0.000000 33.20047 335.4301 180910.60 488.33723 90.54 20.92 1835.4 6.8 1120 12.13816 0.000000 18.43790 255.5425 128499.68 488.80957 97.21 15.94 1836.5 5.3 1150 8.10220 0.000000 16.24498 240.7596 118507.76 482.27536 97.98 15.02 1821.0 3.8 1180 1.07863 0.000000 6.96763 105.7083 51211.25 481.43828 99.38 6.59 1819.0 4.1 1210 0.17933 0.000000 1.69050 27.8751 13496.72 482.28008 99.61 1.74 1821.0 5.0 1240 0.99908 0.000000 0.69618 10.5787 5433.65 485.72934 94.57 0.66 1829.2 7.7 1400 3.55914 0.000000 0.66327 1.7329 1944.94 515.43722 45.92 0.11 1898 43 
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表 2 南河沟铜矿黑云母40Ar/39Ar阶段升温测年数据
Table 2. 40Ar/39Ar stepwise heating analytical data for biotite from the Nanhegou copper deposit
T/℃ 36Ar[fA] 37Ar[fA] 38Ar[fA] 39Ar[fA] 40Ar[fA] 40(r)/39(k) 40Ar(r)/% 39Ar(k)/% 年龄/Ma 2σ 830 73.83705 0.00000 14.72764 39.4528 38567.6 424.52253 43.43 2.02 1687 22 860 52.17596 0.00000 11.17139 62.3765 43778.1 454.65584 64.78 3.19 1764 12 890 88.03006 0.00000 17.61674 48.3965 49039.0 475.77527 46.95 2.48 1815 22 920 71.23406 0.00000 17.06537 145.6097 94135.9 501.92783 77.64 7.45 1877.1 5.9 980 12.25865 0.00000 3.40258 57.2300 30985.5 478.11929 88.31 2.93 1820.9 4.6 1010 42.87751 0.00000 11.56203 154.1373 88390.9 491.24955 85.66 7.89 1852.1 4.8 1040 92.97176 67.87742 21.30473 165.2197 109539.5 496.89904 74.92 8.45 1865 13 1070 76.36794 216.13466 18.24138 186.1223 116213.3 503.69451 80.59 9.52 1881 18 1100 29.05731 0.00000 9.87440 196.6160 105293.6 491.85293 91.84 10.06 1853.5 7.5 1130 11.65506 0.00000 7.23272 226.6876 116192.4 497.36828 97.03 11.60 1866 12 1160 7.28902 0.00000 5.26340 195.9159 100811.9 503.56868 97.86 10.03 1880.9 7.0 1190 1.20144 0.00000 3.93210 190.7202 94653.9 494.43091 99.62 9.76 1859.6 6.1 1220 2.08648 0.00000 4.62702 207.6087 103852.4 497.25665 99.41 10.63 1866 11 1250 1.31157 0.00000 1.41558 61.3139 29824.9 480.10337 98.70 3.14 1825.6 4.7 1300 2.00591 0.00000 0.49516 11.6520 6226.9 483.53157 90.48 0.60 1833.8 9.8 1400 3.61588 0.00000 0.63980 4.9203 3307.1 454.97528 67.69 0.25 1764 21
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表 3 基性岩内石英硫化物脉中白云母40Ar/39Ar阶段升温测年数据
Table 3. 40Ar/39Ar stepwise heating analytical data for muscovite from the sulfides-bearing quartz veins in basic rock
T/℃ 36Ar[fA] 37Ar[fA] 38Ar[fA] 39Ar[fA] 40Ar[fA] 40(r)/39(k) 40Ar(r)/% 39Ar(k)/% 年龄/Ma 2σ 800 192.49119 0.000000 35.23279 8.1862 58186.8 159.48477 2.24 0.23 823 377 860 182.24442 20.265783 36.34226 170.8720 142391.4 518.20823 62.18 4.90 1908 15 950 62.43436 0.000000 16.92114 310.7092 179613.2 518.69200 89.73 8.91 1908.9 5.8 970 88.84845 0.000000 24.61812 482.0375 283437.2 533.52739 90.74 13.82 1942.3 4.5 1000 67.70976 0.000000 21.04461 643.7855 342349.7 500.69218 94.15 18.45 1868 11 1010 32.33111 0.000000 11.97875 467.8146 243796.0 500.71095 96.08 13.41 1868 10 1020 5.73966 0.000000 5.98579 371.6080 186383.5 496.99038 99.09 10.65 1859 10 1030 3.83061 0.000000 2.24855 127.8202 64188.6 493.31844 98.24 3.66 1850.3 4.4 1040 4.65581 0.000000 2.47282 138.1459 69678.5 494.42010 98.02 3.96 1852.9 4.6 1050 3.63382 0.000000 1.64754 86.0923 43276.1 490.19353 97.52 2.47 1842.9 4.3 1060 3.03562 0.000000 1.21217 60.1632 30213.1 487.27011 97.03 1.72 1836.0 6.0 1080 3.26425 0.000000 1.36329 59.4172 29920.7 487.33156 96.78 1.70 1836.2 4.3 1120 2.26651 0.000000 1.80064 104.1546 52818.1 500.67696 98.73 2.99 1867.5 4.5 1140 3.15040 0.000000 2.48257 145.1779 74117.0 504.10790 98.74 4.16 1875.4 5.3 1170 2.98468 0.000000 2.30369 143.1514 72817.8 502.51077 98.79 4.10 1871.7 5.1 1200 2.73909 0.000000 1.87604 107.2493 54743.5 502.88105 98.52 3.07 1872.6 4.5 1240 4.11148 0.000000 1.38814 54.4692 28616.6 503.06264 95.75 1.56 1873.0 4.3 1400 19.53027 0.000000 3.55394 7.6203 9340.3 468.37206 38.21 0.22 1791 29
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① 叶会寿, 李洪英, 毕珉锋, 等.《重要矿种关键问题调查与矿产地质专题填图试点》项目内部报告.2018.
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